Lambda Crateris

Lambda Crateris
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Crater
Right ascension 11h 23m 21.88432s[1]
Declination −18° 46′ 47.8910″[1]
Apparent magnitude (V) 5.08[2]
Characteristics
Spectral type F5 III[3]
U−B color index −0.04[2]
B−V color index +0.43[2]
Astrometry
Radial velocity (Rv)+13.26±0.60[4] km/s
Proper motion (μ) RA: −305.37[1] mas/yr
Dec.: +27.56[1] mas/yr
Parallax (π)23.32 ± 0.80 mas[1]
Distance140 ± 5 ly
(43 ± 1 pc)
Absolute magnitude (MV)+1.92[5]
Orbit[6]
Period (P)1,940±84 d[7]
Eccentricity (e)0.54
Periastron epoch (T)32722
Argument of periastron (ω)
(secondary)		140.7°
Semi-amplitude (K1)
(primary)		2.5 km/s
Details
Mass1.78[8] M☉
Radius2.8[9] R☉
Luminosity14.4[5] L☉
Surface gravity (log g)4.06±0.11[4] cgs
Temperature6,582±54[4] K
Metallicity [Fe/H]−0.15±0.01[4] dex
Rotational velocity (v sin i)17.0[10] km/s
Other designations
λ Crt, 13 Crateris, BD−17° 3367, HD 98991, HIP 55598, HR 4395, SAO 156646.[11]
Database references
SIMBADdata

Lambda Crateris, Latinized from λ Crateris, is the Bayer designation for a suspected binary star[12] system in the southern constellation of Crater. With an annual parallax shift of 23.32[1] milliarcsecond as observed from Earth, it is located around 140 light years from the Sun. It is faintly visible to the naked eye with an apparent visual magnitude of 5.08.[2]

This is a probable astrometric binary[12] star system, with orbital elements first reported by Abt and Levy (1976). However, Morbey and Griffin (1987) later cast some doubt on the validity of these results, suggesting that further review is needed.[13] The visible member of this system, component A, is an evolved F-type giant star[10] with a stellar classification of F5 III.[3] It has an estimated 1.78[8] times the mass of the Sun and 2.8[9] times the Sun's radius. The star is spinning with a projected rotational velocity of 17[10] km/s.

  1. ^ a b c d e f Cite error: The named reference vanLeeuwen2007 was invoked but never defined (see the help page).
  2. ^ a b c d Cite error: The named reference Mermilliod1986 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference abt2009 was invoked but never defined (see the help page).
  4. ^ a b c d Cite error: The named reference Kordopatis2013 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference Fletcher1978 was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference Abt1976 was invoked but never defined (see the help page).
  8. ^ a b Cite error: The named reference Tokovinin2014 was invoked but never defined (see the help page).
  9. ^ a b Cite error: The named reference aaa367_521 was invoked but never defined (see the help page).
  10. ^ a b c Cite error: The named reference Schroeder2009 was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  12. ^ a b Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).
  13. ^ Cite error: The named reference Morbey1987 was invoked but never defined (see the help page).